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Problem

Herbicide injury from lipid biosynthesis (Acetyl CoA carboxylase or ACCase) inhibitors including fenoxaprop-P, fluazifop-P and other aryloxyphenoxypropionates (FOPs) or cyclohexanedinones (DIMs) such as clethodim, sethoxydim and others.

A few sensitive varieties of dicot plants exhibit variable symptoms, for example:

Tip die-back in sensitive varieties of ground cover junipers

Leaf burn (potentially from solvents) on certain azalea varieties

Red pigment loss in flower petals of sensitive tulip varieties

Plant Entry and Symptom Expression

Foliar applied and symplastically translocated throughout the plant. There is very little if any soil activity. Lipid biosynthesis inhibition starts with new growth within one week, spreads over entire plant including rhizomes, causing death in about 2 to 3 weeks. Low application rates may reduce flowering and seedhead production.

Similar Problems

Organic arsenical including DSMA and MSMA causing desiccation and death of annual and selected perennial grasses.

Quinclorac may produce similar symptoms in grasses, but will also cause synthetic auxin symptoms in dicots, whereas most dicots are unaffected by ACCase inhibitor herbicides

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